Anti-cavitation valve assembly

Abstract

A valve assembly for reducing cavitation includes a seat disposed within a valve housing intermediate a fluid inlet and outlet thereof. A disc guide is associated with the seat so as to be slidably moveable relative to the seat. The seat includes a wall defining an inner-chamber and having elongated slots formed therein so as to direct fluid towards a central portion of the fluid chamber. The disc guide includes a wall having elongated slots formed on an upper portion thereof, and a non-slotted lower portion configured to substantially occlude the elongated slots of the seat when the disc guide is moved into a closed position.

Description

RELATED APPLICATION[0001]This application claims the benefit of U.S. Provisional Application No. 60 / 542,111, filed Feb. 4, 2004.BACKGROUND OF THE INVENTION[0002]The present invention generally relates to control valves in high pressure fluid transfer systems. More particularly, the present invention relates to a control valve having anti-cavitation and low-noise properties.[0003]When subjected to high-pressure differentials or high flow rates, valves often exhibit excessive noise and vibration. This is usually attributable to the phenomenon of cavitation, which can range from relatively harmless levels called incipient cavitation to significantly more acute levels that actually damage valves and related piping. This can be loud enough to cause hearing loss in plant personnel if subjected to it for extended periods of time. Cavitation occurs if the velocity of the fluid in the valve seating area becomes excessive, creating a sudden severe reduction in pressure that transforms the liq...

AI Technical Summary

Benefits of technology

[0009]The present invention resides in a valve assembly which reduces pressure through the valve while substantially eliminating cavitation and its attendant disadvantages. The valve assembly of the present invention also directs the fluids through the valve such that damage is minimized by other forces, such as fluid flow.

[0014]When the disc guide and seat are moved into a closed position, fluid is prevented from passing from the housing fluid inlet to the housing fluid outlet. When the disc guide and seat are moved into an open position, fluid is directed from the housing fluid inlet through the seat elongated slots, into the seat inner-chamber, into the disc guide inner-chamber, and through the disc elongated slots to the housing fluid outlet, resulting in reduced fluid pressure while minimizing cavitation.

Problems solved by technology

When subjected to high-pressure differentials or high flow rates, valves often exhibit excessive noise and vibration.

This can be loud enough to cause hearing loss in plant personnel if subjected to it for extended periods of time.

Cavitation occurs if the velocity of the fluid in the valve seating area becomes excessive, creating a sudden severe reduction in pressure that transforms the liquid into a vapor state, resulting in the formation of literally thousands of minute bubbles.

Should this occur in close proximity to any metal surface, damage can take place.

Over time, this can lead to valve failure due to the vibration and / or erosion.

Minimizing or eliminating these conditions that adversely effect operation and service life of the valve continues to be one of the most serious challenges encountered in the daily operation of a water distribution system, such as municipal water systems and the like.

While effectively reducing noise and cavitation, these devices are not optimal.

The primary disadvantage of such designs is that the valve capacity is significantly lowered, rendering these valves inapplicable in certain situations.

Such valve designs also require fairly complex and expensive manufacturing and assembly.

However, the number and size of aperture in the plates, the number of plates, and their spacing are determined by fluid flow, and varying flows can make such orifice plates ineffective.

However, this valve assembly is prone to fouling or clogging due to the use of the small round apertures in the canisters.

Moreover, when the fluid exits the canisters of the Singer valve assembly, it is directed directly at the housing wall, causing erosion.

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